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Rachel Nickell: The Untold Story is the latest programme in ITV's Crime and Punishment Season.

During her 26 years working as a news reporter and presenter, Fiona Bruce has covered some of UK’s most shocking crimes, but the murder of Rachel Nickell on Wimbledon Common in July 1992 is one that has stayed with her more than most.

This programme, made by Keo Films, sees Fiona revisit the crime. Speaking to key figures involved in the case, she uncovers what went wrong in the original inquiry, how the case was solved and why the human impact of this crime lingers even now.

She said: “Filming this documentary has brought back to me my memories of Rachel’s murder, the pursuit of Colin Stagg as a suspect and the sensational collapse of the case against him.

“Rachel’s murder is one I will never forget.”

In July 1992, the horror of a 23-year-old mother being savagely murdered in broad daylight within a popular London park, in front of her infant son, was one that appalled the nation. The case garnered huge coverage in the press and news media, placing enormous pressure on the police investigation that followed.

In the programme Fiona meets key figures whose lives and careers have been affected by this controversial case including Colin Stagg, who was charged and acquitted of Rachel’s murder. Stagg talks about what it was like to be pursued by police for a brutal murder that he did not commit and how he has struggled, over the last 25 years, not to allow what happened on Wimbledon Common in 1992 to define him and his future.

The programme also features people who are speaking for the first time in a television documentary about the case. These include Rt. Hon. Sir Harry Ognall, the former High Court Judge whose ruling at the Old Bailey in September 1994 set Colin Stagg free; Roy Ramm who was in charge of the specialist undercover unit that supplied the officer for the covert police operation against their prime suspect, Colin Stagg; and William Clegg QC, one of the most experienced criminal barristers in the country who holds the unique position of having defended both the acquitted Colin Stagg (in his trial for the murder of Rachel Nickell) and Robert Napper, who was eventually convicted of Rachel’s murder, in his trial for the murders of Samantha and Jazmine Bisset.

The programme aims to take an in-depth look at an appalling and tragic case that has changed lives, ended careers, tarnished reputations and ultimately changed policing.